Windows-1252

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Windows-1252 or CP-1252 (code page 1252) is a single-byte character encoding of the Latin alphabet (or superset of), that was used used by default in e.g. (legacy components of) Microsoft Windows for English and many (European) languages including Spanish, Portuguese, French, and German. This character-encoding scheme is used throughout the Americas, Western Europe, Oceania, and much of Africa. Windows (and most other operating systems) now uses Unicode character sets by default.

Windows-1252
Windows-1252-infobox.svg
MIME / IANAwindows-1252[1]
Alias(es)cp1252 (code page 1252)
Language(s)Basically all supported by ISO/IEC 8859-1 e.g. English, Danish (except for a rare exceptional letter), Irish, Italian, Norwegian, Portuguese, Spanish, Swedish, German, Finnish, Icelandic, French, Faroese, Luxembourgish, Albanian, Estonian, Swahili, Tswana, Catalan, Basque, Occitan, Rotokas, Romansh, Dutch (except the IJ/ij character, substituted by IJ/ÿ), and Slovene (except the č character, substituted by ç).
Created byMicrosoft
StandardWHATWG Encoding Standard
Classificationextended ASCII, Windows-125x
ExtendsISO 8859-1 (excluding C1 controls)
Transforms / EncodesISO 8859-15

It is the most-used single-byte character encoding in the world. As of January 2023, only 0.3% of all websites declared use of Windows-1252,[2][3] but at the same time 1.4%[2] declare ISO 8859-1 (and slightly more or 15 of the top 1000 websites[4]), which is treated as Windows-1252 by all modern browsers (as demanded by HTML5 standard[5]), so that 1.7% of websites effectively use Windows-1252, that total is greater than any other single-byte encoding. Pages declared as ASCII, or a missing or invalid charset, are assumed to be Windows-1252 as well.[citation needed] An unknown (but probably large) subset of other code pages declared (or if UTF-8 declared) use only the ASCII portion (of UTF-8), and could then be counted as Windows-1252 or other such extended ASCII superset, or even UTF-8.

Depending on the country or language, use (on websites at least) can be much higher than the global average, e.g., for Brazil according to website use (including ISO-8859-1), use is at 9.2%,[6] and in Germany at 4.0%.[7][8]

DetailsEdit

This character encoding is a superset of ISO 8859-1 in terms of printable characters, but differs from the IANA's ISO-8859-1 by adding additional characters in the 80 to 9F (hex) range (the ISO standards reserve this range for control characters). Notable additional characters include curly quotation marks and all printable characters from ISO 8859-15. It is known to Windows by the code page number 1252, and by the IANA-approved name "windows-1252".

At one stage many Microsoft internet products produced text in Windows-1252 but marked as ISO-8859-1. A result was that all the quotes and apostrophes (produced by "smart quotes") were replaced with question marks or boxes when viewed on non-Windows operating systems. Most modern web browsers and e-mail clients treat the media type charset ISO-8859-1 as Windows-1252 to accommodate such mislabeling. This behavior is now required by the HTML5 specification.[5] Browsers appear to treat the charset "ASCII" and missing charsets the same.

Historically, the phrase "ANSI Code Page" was used in Windows to refer to non-DOS encodings; the intention was that most of these would be ANSI standards such as ISO-8859-1. Even though Windows-1252 was the first and by far most popular code page named so in Microsoft Windows parlance, the code page has never been an ANSI standard. Microsoft explains, "The term ANSI as used to signify Windows code pages is a historical reference, but is nowadays a misnomer that continues to persist in the Windows community."[9]

In LaTeX packages, CP-1252 is referred to as "ansinew".

IBM uses code page 1252 (CCSID 1252 and euro sign extended CCSID 5348) for Windows-1252.[10][11][12]

It is called "WE8MSWIN1252" by Oracle.[13]

Codepage layoutEdit

The following table shows Windows-1252. Differences from ISO-8859-1 have the Unicode code point number below the character, based on the Unicode.org mapping of Windows-1252 with "best fit". A tooltip, generally available only when one points to the immediate left of the character, shows the Unicode code point name and the decimal Alt code.

Windows-1252 (CP1252)[14][15][16][17][18]
0 1 2 3 4 5 6 7 8 9 A B C D E F
0_ NUL SOH STX ETX EOT ENQ ACK BEL BS HT LF VT FF CR SO SI
1_ DLE DC1 DC2 DC3 DC4 NAK SYN ETB CAN EM SUB ESC FS GS RS US
2_  SP  ! " # $ % & ' ( ) * + , - . /
3_ 0 1 2 3 4 5 6 7 8 9 : ; < = > ?
4_ @ A B C D E F G H I J K L M N O
5_ P Q R S T U V W X Y Z [ \ ] ^ _
6_ ` a b c d e f g h i j k l m n o
7_ p q r s t u v w x y z { | } ~ DEL
8_
20AC

201A
ƒ
0192

201E

2026

2020

2021
ˆ
02C6

2030
Š
0160

2039
Œ
0152
Ž
017D
9_
2018

2019

201C

201D

2022

2013

2014
˜
02DC

2122
š
0161

203A
œ
0153
ž
017E
Ÿ
0178
A_ NBSP ¡ ¢ £ ¤ ¥ ¦ § ¨ © ª « ¬ SHY ® ¯
B_ ° ± ² ³ ´ µ · ¸ ¹ º » ¼ ½ ¾ ¿
C_ À Á Â Ã Ä Å Æ Ç È É Ê Ë Ì Í Î Ï
D_ Ð Ñ Ò Ó Ô Õ Ö × Ø Ù Ú Û Ü Ý Þ ß
E_ à á â ã ä å æ ç è é ê ë ì í î ï
F_ ð ñ ò ó ô õ ö ÷ ø ù ú û ü ý þ ÿ

  According to the information on Microsoft's and the Unicode Consortium's websites, positions 81, 8D, 8F, 90, and 9D are unused; however, the Windows API MultiByteToWideChar maps these to the corresponding C1 control codes. The "best fit" mapping documents this behavior, too.[14]

HistoryEdit

  • The first version of the codepage 1252 used in Microsoft Windows 1.0 did not have positions D7 and F7 defined. All the characters in the ranges 80–9F were undefined too.
  • The second version, used in Microsoft Windows 2.0, positions D7, F7, 91, and 92 had been defined.
  • The third version, used since Microsoft Windows 3.1, had all the present-day positions defined, except euro sign and Z with caron character pair.
  • The final version listed above debuted in Microsoft Windows 98 and was ported to older versions of Windows with the euro symbol update.

OS/2 extensionsEdit

The OS/2 operating system supports an encoding by the name of Code page 1004 (CCSID 1004) or "Windows Extended".[19][20] This mostly matches code page 1252, with the exception of certain C0 control characters being replaced by diacritic characters.

Code page 1004 (differing rows only)[21][22][23][24]
0 1 2 3 4 5 6 7 8 9 A B C D E F
0_ NUL SOH STX ETX ˉ
02C9
˘
02D8
˙
02D9
BEL ˚
02DA
HT ˝
02DD
˛
02DB
ˇ
02C7
CR SO SI

MSDOS extensions [rare]Edit

There is a rarely used, but useful, graphics extended code page 1252 where codes 0x00 to 0x1f allow for box drawing as used in applications such as MSDOS Edit and Codeview. One of the applications to use this code page was an Intel Corporation Install/Recovery disk image utility from mid/late 1995. These programs were written for its P6 User Test Program machines (US example[25]). It was used exclusively in its then EMEA region (Europe, Middle East & Africa). In time the programs were changed to use code page 850.

Graphics Extended Code Page 1252[citation needed]
0 1 2 3 4 5 6 7 8 9 A B C D E F
0_
1_

Palm OS variantEdit

This variant of Windows-1252 is used by Palm OS 3.5. Python gives it the palmos label.[26] Differences from Windows-1252 have their Unicode code point.

Palm OS code page[27]
0 1 2 3 4 5 6 7 8 9 A B C D E F
8_ ƒ ˆ Š Œ
2666

2663

2665
9_
2660
˜  š œ Ÿ

See alsoEdit

ReferencesEdit

  1. ^ Character Sets, Internet Assigned Numbers Authority (IANA), 2018-12-12
  2. ^ a b "Historical trends in the usage statistics of character encodings for websites, January 2023". w3techs.com. Retrieved 2023-01-16.
  3. ^ "Frequenty Asked Questions". w3techs.com.
  4. ^ "Usage Survey of Character Encodings broken down by Ranking". w3techs.com. Retrieved 2023-01-16.
  5. ^ a b "Encoding". WHATWG. 27 January 2015. sec. 5.2 Names and labels. Archived from the original on 4 February 2015. Retrieved 4 February 2015.
  6. ^ "Distribution of Character Encodings among websites that use Brazil". w3techs.com. Retrieved 2023-01-16.
  7. ^ "Distribution of Character Encodings among websites that use .de". w3techs.com. Retrieved 2023-01-16.
  8. ^ "Distribution of Character Encodings among websites that use German". w3techs.com. Retrieved 2023-01-16.
  9. ^ Wissink, Cathy (5 April 2002). "Unicode and Windows XP" (PDF). Microsoft. p. 1. Archived (PDF) from the original on 4 February 2015. Retrieved 4 February 2015.
  10. ^ "Code page 1252 information document". Archived from the original on 2016-03-03.
  11. ^ "CCSID 1252 information document". Archived from the original on 2016-03-26.
  12. ^ "CCSID 5348 information document". Archived from the original on 2014-11-29.
  13. ^ "Database Client Installation Guide". Oracle. Retrieved 2021-02-14.
  14. ^ a b "Unicode mappings of Windows-1252 with 'Best Fit'". Unicode. Archived from the original on 4 February 2015. Retrieved 4 February 2015.
  15. ^ Code Page CPGID 01252 (pdf) (PDF), IBM
  16. ^ Code Page CPGID 01252 (txt), IBM
  17. ^ International Components for Unicode (ICU), ibm-1252_P100-2000.ucm, 2002-12-03
  18. ^ International Components for Unicode (ICU), ibm-5348_P100-1997.ucm, 2002-12-03
  19. ^ "Code page 1004 information document". Archived from the original on 2015-06-25.
  20. ^ "CCSID 1004 information document". Archived from the original on 2016-03-26.
  21. ^ "Code Page 01004" (PDF). IBM. Archived from the original (PDF) on 2015-07-08. (version based on Windows 3.1 version of Windows-1252)
  22. ^ Code Page CPGID 01004 (pdf) (PDF), IBM
  23. ^ Code Page CPGID 01004 (txt), IBM
  24. ^ Borgendale, Ken (2001). "Codepage 1004 - Windows Extended". OS/2 codepages by number. Archived from the original on 2018-05-13. Retrieved 2018-05-13. (version based on current version of Windows-1252)
  25. ^ Storaasli, Olaf (1996). "Performance of the NASA equation solvers on computational mechanics applications" (PDF). Performance of NASA Equation Solvers on Computational Mechanics Applications. NASA. doi:10.2514/6.1996-1505. S2CID 15711051. Archived from the original (PDF) on 2019-05-03.
  26. ^ "codecs — Codec registry and base classes (§ Text Encodings)". The Python Standard Library—Python 3.9.4 Documentation. Python Software Foundation.
  27. ^ Mullender, Sjoerd (9 December 2021). "Python Character Mapping Codec for Palm OS 3.5". CPython source tree. Python Software Foundation.

External linksEdit